🚀 go-pugleaf

In article <830283694snz@longley.demon.co.uk>
           David@longley.demon.co.uk "David Longley" writes:

> I'd be grateful if someone who has the figures could explain in detail how
> the image loss comes about from say VHS --> half PAL capture --> MPEG

Depending on the specific system, ISTR that VHS has a luminance bandwidth of 
less than 3.5MHz (chrominance is much less than this), hence, approximately 
140,000 pixels per full frame, or 224 pixels per line. For a moving image, 
it appears much greater than this as the eye and brain interpolate the images.
                                                       
Further loss is imposed when the signal is digitised to a finite number of 
levels and then again when the MPEG compression removes parts that it 
considers unimportant.

Mike.